Art. I.—Electro-Magnetic Experiments, forming a Sequel to the Memoir on the Application of Electro-Magnetism to the Movement of Machines; presented to the Royal Academy of Sciences of St. Petersburg. By M. H. Jacobi, Doctor of Science, and Professor at the University of Dorpat
Art. VI.—On a new Instrument for the direct Observation of the Changes in the Intensity of the Horizontal Portion of the Terrestrial Magnetic Force. By Carl Friedrich Gauss
Art. XII.— Determination of the Axes of the Elliptic Spheroid of Revolution which most nearly corresponds with the existing Measurements of Arcs of the Meridian. By F. W. Bessel